/Engine/Plugins/MovieScene/MovieRenderPipeline/Source/MovieRenderPipelineCore/Public/Graph/MovieGraphConfig.h
Adds a new variable member with default values to the graph. The new variable will have a base name of "Variable" unless specified in InCustomBaseName. Returns the new variable on success, else nullptr.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Experimental") [UMovieGraphVariable](API\Plugins\MovieRenderPipelineCore\Graph\UMovieGraphVariable) * AddVariable ( const [FName](API\Runtime\Core\UObject\FName) InCustomBaseName )